🔍 Key Concepts

• Centrifugal pump internal flow path and casing design • Propeller (axial-flow) pump characteristics and when they are used • Role of a volute and how it affects fluid velocity and pressure

💭 Think About

• Think about how a centrifugal pump changes high-velocity water into pressure — what part of the casing helps do that? • Consider how water moves through a propeller/axial-flow pump. Is the flow mainly radial or straight through? What does that suggest about the casing shape? • Ask yourself which component is closely associated with radial flow and swirling discharge versus straight-through axial flow.

✅ Before You Answer

• Identify which pump type normally has a volute-shaped casing around the impeller. • Decide whether a propeller pump usually needs a volute, or if it uses a simpler, straight-through casing or tube. • Confirm that a centrifugal pump’s main difference here is about its casing shape, not pistons or nozzles.